The DB1 is a self-calibrating system that measures water level (or other liquids), such as measurement in channels and stilling wells. It detects level by measuring the pressure required to force nitrogen bubbles from a pair of submerged tubes. The orifices of the tubes are separated by a fixed vertical distance. The pressure line that is measured is determined by the datalogger, which opens and closes valves on the manifold assembly. A single pressure transducer measures each of the tubes, as well as the atmospheric pressure. This technique compensates for temperature effects and long-term drift in the transducer, producing a more accurate measurement.

The CS475, CS476, and CS477 series of radar-based water-level sensors brings a highly accurate innovation to Campbell Scientific's array of sensors. Mounted above the water surface to be measured, the sensors use radar—short microwave pulses—to detect the distance from the sensor to the top of the water. Changes in the level of the surface are measured and used to calculate depth, flow rate, or volume of the water. The sensors do not come into contact with the liquid, avoiding corrosion, contamination, and debris damage. That, and the fact that there are no moving parts, make the sensors very low maintenance.

The CS475, CS476, and CS477 series of radar-based water-level sensors brings a highly accurate innovation to Campbell Scientific's array of sensors. The CS476 is built for higher accuracy and a longer range. Mounted above the water surface to be measured, the sensors use radar—short microwave pulses—to detect the distance from the sensor to the top of the water. Changes in the level of the surface are measured and used to calculate depth, flow rate, or volume of the water. The sensors do not come into contact with the liquid, avoiding corrosion, contamination, and debris damage. That, and the fact that there are no moving parts, make the sensors very low maintenance.

The CS410 is a shaft encoder designed for water level measurements. A pulley attached to a a float and counter-weight rotates as water level rises or falls, and the shaft encoder sends two pulse strings to the datalogger. The datalogger records the pulse strings, and the water level is calculated by adding and subtacting the clockwise or counter clockwise movement to a running total.